I must be living under a rock, but at least where I come from, it is common sense that some sun exposure is good. I've never heard of anyone saying that the sun should be avoided at all costs, it's weird. but then you find people on the internet who claim that cats (of all animals!) should stay at home at all costs. that's also weird. But these are mostly internet people, I've never found one in real life...

Maybe the general problem is that the internet has very vocal minorities.